L Connection Network Back-Up Mode Requirements; Heating And Cooling Stages In Room Sensor Mode; Start-Up Delay In Room Sensor Mode; Blower Operation (Occupied) In Room Sensor Mode - Lennox Prodigy 2.0 Application Manual

2.2.4.

L Connection Network Back-Up Mode Requirements

Go to SETUP > NETWORK INTEGRATION wizard to configure a back up mode option. Use table 6 references the wizard
path to the backup mode setting.
NETWORK NETWORK =
INTEGRATION L-CONNECTION
Back-up mode option is used when the communication link has been lost on the L Connection system bus. Five minutes
after communication is interrupted, the M3 Unit Controller will start using the configured back-up mode and applicable set
points. The M3 Unit Controller will default to back-up set points for occupied heat or cool modes.
During normal room sensor operation with a Network Control Panel, the occupied demands are sent over the network and
the occupied input on P297-8 is ignored. The occupied input on P297­8 is only read if the network communication link is lost
and the back­up mode is set to Local Thermostat.
Room sensor mode will have a default of occupied. If communications is lost the system will remain in the last state it
received until communication is restored or power is cycled. At this point after the delays the units should go to a occupied
back up mode regardless of any input at P297­8 which will be ignored.
2.2.5.

Heating and Cooling Stages in Room Sensor Mode

In Room Sensor Mode default operation, the M3 Unit Controller controls up to 4-stages of heating and 4-stages of cooling.
See figure 4 and Parameters in Appendix B.
The number of stages achieved depends on the type of equipment and whether or not an economizer is used. On units with
economizers, free cooling becomes stage 1 and all compressor stages shift up one stage. On units with four (4)
compressors and an economizer, compressors 3 and 4 are controlled together for stage 4.
2.2.6.

Start-Up Delay in Room Sensor Mode

In Room Sensor Mode, the M3 Unit Controller initiates a start up delay on any power-up or reset (two minute default). During
the delay, no blower, heating, or cooling operation will occur. This delay may be adjusted using Parameter 133 to stagger the
start of each unit, reducing the initial power demand. Adjustable range is 120 to 1800 seconds.
Go to SETTINGS > RTU OPTION > EDIT PARAMETER =133 (ZON SENS STRTUP DLY)
2.2.7.

Blower Operation (Occupied) in Room Sensor Mode

In Room Sensor Mode, default operation, the M3 Unit Controller cycles the blower with a heat/cool demand. The menu path
as listed in table 5 will allow a changed to continuous blower operation.
OCC (OCCUPIED) blower mode description:
•
AUTO CYCLE: Blower cycles with demand
•
ON-CONTINUOUS 1: Blower is on with either the occupancy sensor or occupancy scheduler indicates occupied.
•
ON-CONTINUOUS 2: Blower is on only WITH both the occupancy sensor and occupancy scheduler, BOTH indicates
occupied.
•
ON-CONTINUOUS 3: Blower is on only when both the occupancy sensor and occupancy scheduler indicates occupied.
in addition, blower will be on a minimum of 25% of the time when occupancy scheduler indicates occupied by the
occupancy sensor indicates not occupied. The 25% minimum is achieved by turning blower on for 30 minutes and off
for 90 minutes.
Table 6. Menu Interface (Level 1 - SETUP)
LCONN ADDRESS = X
•
•
•
•
CONTROL MODE =
ROOM SENSOR,
•
MONITOR ONLY OR
NETWORK
THERMOSTAT
•
•
•
•
Page 11
NETWORK SENSOR CO2 = YES OR NO
NETWORK SENSOR RELATIVE HUMIDITY = YES OR NO
NETWORK SENSOR TEMPEATURE = YES OR NO
ROOM SENSOR OCC BLOWER MODE= AUTO CYCLES OR ON-
CONTINUOUS 1, 2 OR 3 *
BACKUP MODE = NONE, ROOM SENSOR, RETURN AIR BACKUP
OR THERMOSTAT
BACKUP SETPOINTS OCCUPIED HEAT = XX.X F
BACKUP SETPOINTS UNOCCUPIED HEAT = XX.X F
BACKUP SETPOINTS OCCUPIED COOL = XX.X F
BACKUP SETPOINTS UNOCCUPIED COOL = XX.X F